Nancy Friedrich

Editor-in-Chief
Microwaves & RF

Nancy Friedrich began her career in technical publishing in 1998. After a stint with sister publication Electronic Design as Chief Copy Editor, Nancy worked as Managing Editor of Embedded Systems Development. She then became a Technology Editor at Wireless Systems Design, an offshoot of Microwaves & RF. Nancy has called the microwave space “home” since 2005.

Articles by Nancy Friedrich
Microstrip Circulator Topology Boasts Rectangular Ferrite Region
Typical junction circulators are composed of ferrite material—usually circular, hexagonal, or triangular in shape—surrounded by a uniform dielectric. Microstrip traces are then patterned on top with ports emanating at equal intervals in the azimuthal ...
Fractal Electrodynamics Improves Kokh Antenna Bandwidth
In fractal electrodynamics, fractal geometry is combined with electromagnetic theory in order to investigate a new class of radiation, propagation, and scattering problems. When fractals are applied to antenna elements, the result is smaller resonant ...
Innovations Lead To Multi-Pronged Homeland Defense
To stay a step ahead of any threat, RF products and communications are securing points of entry, ports, airlines, and any other vulnerable spot.
Real-Time Spectrum Analyzers Handle Advanced Radar Measurements
Today's advanced radars are notoriously hard to test. Simply put, the radar is beyond the scope of most standard measurement equipment. To simplify diagnostic troubleshooting and production test for radar applications, Tektronix, Inc. (Beaverton, OR) has ...
Software-Defined Radios Place Stringent Demands On Test Equipment
Software-Defined Radios (SDRS) eliminate incompatibilities between the command and control radio systems of different armed-services branches. They also link the communications systems of allied and coalition forces, thereby helping these different ...
Economy Spectrum Analyzers Span 9 kHz To 20 GHz
In the past, less-costly microwave spectrum analysis came at the price of some performance. Yet the MS271xB family of microwave spectrum analyzers vows to provide high performance at an affordable price. The three models feature 1-Hz-to-3-MHz ...
100-W GaN-On-Si Transistor Targets WiMAX
The market for 2.5-GHz WiMAX solutions is growing rapidly, thereby inspiring a legion of new products. One example is a 28-V, 100-W gallium-nitride (GaN), high-electron mobility transistor (HEMT). The NPT25100 GaN-on-silicon (Si) power transistor is ...
TCXO Delivers Stability To 7 x 108
To satisfy applications that require excellent stability, almost no heat dissipation, and no warmup time, a microprocessor-controlled temperature-compensated crystal oscillator (TCXO) has been spawned. The T1220 offers oven-controlled-like ...
FSS Design Concept Uses Silicon As Switch Substrate
Usually, a frequency-selective surface (FSS) comprises one or more screens with two-dimensional periodic patterns, which are generated by a unit cell containing metallic patches or apertures. Now, a design composed of a metallic cross-dipole ...
Pulse Generator Delivers 500-ps Output Pulse Width At 40-mV Amplitude
Unlike other RF systems, which use a narrowband carrier, impulse-radio-Ultra-Wide-Band (IRUWB) wireless communication is carrierless. It utilizes short pulse signals to transmit data over a very wide spectrum for short-range, high-data-rate ...
Active Doubler Includes Booster Amplifier
A new active doubler is versatile enough to be either operated in a saturated power mode or backed off for linear applications. The model XX1001-QK accepts input signals from 18 to 21 GHz and provides output signals from 36 to 42 GHz with +25 ...
High-Impedance Electromagnetic Surface Improves Antenna Performance
High-impedance electromagnetic surface (HIS) is a new kind of artificial metallic electromagnetic structure. By not supporting propagating surface currents in the manner of conventional metallic conductors, HIS technology offers advantages to ...
Amplifiers Perform Up To Standards Of WiMAX Output Devices
WiMax output devices are tested to verify the amplifier device's linearity as well as the fidelity of the signal that is being amplified. A test amplifier must boost WiMAX signals with sufficient power while maintaining original signal quality. ...
Power Dividers Extend From 380 To 2700 MHz
By leveraging a unique airline coaxial structure, a line of unequal power dividers manages to maintain a fixed split ratio over a 380-to-2700-MHz bandwidth. Ripple and insertion loss are kept to a minimum. Insertion loss, for example, is 1.36 dB ...
Subsystem Performance Is Defined For Multicarrier 3G Transceiver
Although there are potentially many benefits from a wideband-code-division-multiple-access (WCDMA) multicarrier third-generation (3G) transceiver, questions remain about whether the implementation of such a transceiver is feasible. In "Multicarrier ...
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